JP2004257908A - Waveform display device and waveform displaying method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To actualize a waveform display device for easily performing observation and measurement on a plurality of waveforms, and a waveform displaying method. <P>SOLUTION: This device is obtained by improving on a waveform display device for displaying a plurality of waveforms based on waveform data obtained by measuring signals to be measured in a display area of a display screen. This device is characterized by being provided with a determination means for determining respective measurement cycles of the displayed waveform data and a division display means for dividing the display area for each of the measurement cycles based on the result of determination made by the determination means to display waveforms measured in the same measurement cycles in the divided display areas. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a waveform display device and a waveform display method for displaying a plurality of waveforms based on waveform data obtained by measuring a signal under measurement in a display area of a display screen, and more particularly, to an observation and measurement of a plurality of waveforms. The present invention relates to a waveform display device and a waveform display method that can be easily performed.
[0002]
[Prior art]
The waveform measuring device converts various physical quantities, such as temperature, pressure, strain resistance, etc., into electric signals by a conversion means suitable for each application, performs measurement, and stores the data as waveform data. The apparatus displays a waveform in a display area of a display screen based on the stored waveform data, thereby observing and measuring a change in these electric signals, that is, a change in a physical quantity. Of course, electrical signals such as input / output signals to electronic circuits can also be displayed. Such devices include, for example, a paperless recorder, a digital oscilloscope, and the like.
[0003]
The waveform display device used in this waveform measurement device can display a plurality of waveforms simultaneously, for example, with the vertical axis representing the voltage value and the horizontal axis representing the time (for example, see Patent Document 1).
[0004]
[Patent Document 1]
JP-A-8-29455 [0005]
[Problems to be solved by the invention]
However, when measuring various physical quantities, it is necessary to perform measurement at an optimal measurement cycle. For example, a signal having a gradual change such as temperature is measured at a slow measurement period (for example, at intervals of 1 [s]), and a signal having a fast change such as an input / output signal to an electronic circuit is measured at a fast measurement period (for example, The measurement is performed at an interval of 10 [ms].
[0006]
FIG. 9 shows a display example of waveform data measured at such different measurement periods. In FIG. 9, a waveform 100 is measured at a fast measurement cycle (for example, 10 [ms]), and a waveform 101 is measured at a slow measurement cycle (for example, 1 [s]). FIG. 9A is a display example when the display is performed according to the fast measurement cycle, and FIG. 9B is a display example when the display is performed according to the slow measurement cycle.
[0007]
In FIG. 9A, the horizontal axis is set and displayed so that the waveform 100 is easy to see. Therefore, the waveform 101 becomes flat, and it becomes difficult to observe and measure the waveform 101. On the other hand, in FIG. 9B, the horizontal axis is set and displayed so that the waveform 101 is easy to see. Therefore, the waveform 100 is displayed crushed with respect to the time axis, and it becomes difficult to observe and measure the waveform 100. That is, when observing and measuring signals having different temporal changes, there is a problem that it is difficult to optimally display the waveforms 100 and 101 of all the signals.
[0008]
Therefore, an object of the present invention is to realize a waveform display device capable of easily observing and measuring a plurality of waveforms.
[0009]
[Means for Solving the Problems]
The invention according to claim 1 is
In a waveform display device that displays a plurality of waveforms based on waveform data obtained by measuring a signal under measurement in a display area of a display screen,
Determining means for determining the measurement cycle of each of the displayed waveform data;
Split display means for dividing the display area for each measurement cycle based on the determination result of the determination means, and displaying the waveform of the measurement cycle in the divided display area. It is.
[0010]
The invention according to claim 2 is the invention according to claim 1,
The divided display means divides the display area based on the shape of the display area and the determination result.
[0011]
The invention according to claim 3 is the invention according to claim 2,
The divided display unit is characterized in that the divided display areas have the same size.
[0012]
The invention according to claim 4 is the invention according to any one of claims 1 to 3,
Cursor means is provided for displaying a cursor in each of the display areas divided by the divided display means, and displaying these cursors at the same time position or at a position at a nearby time.
[0013]
The invention according to claim 5 is
In a waveform display method of displaying a plurality of waveforms based on waveform data obtained by measuring a signal under measurement in a display area of a display screen,
Determine the measurement cycle of each of the displayed waveform data,
The method is characterized in that the display area is divided for each measurement cycle based on the determination result, and the waveform of the measurement cycle is displayed in the divided display area.
[0014]
The invention according to claim 6 is the invention according to claim 5,
A method is characterized in that cursors are displayed in each of the divided display areas, and these cursors are displayed at the same time position or near time positions.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[First Embodiment]
FIG. 1 is a configuration diagram showing a first embodiment of the present invention. In FIG. 1, measurement units 10, 11, 12,..., 1n receive a signal to be measured, convert the signal to be measured into waveform data which is a digital signal, and output the data. The memory 20 receives and stores waveform data from the measurement units 10 to 1n. The display processing unit 30 includes a determination unit 31 and a divided display unit 32, reads out waveform data from the memory 20, performs desired processing on the waveform data, and displays a waveform on a display screen (not shown) of the display unit 40. Display in the display area.
[0016]
Further, the determination unit 31 determines the measurement cycle of each of the waveform data read by the display processing unit 30, that is, each waveform data displayed on the display unit 40. The divided display unit 32 divides the display area of the display screen of the display unit 40 for each measurement cycle based on the determination result of the determination unit 31, and displays a waveform in each of the divided display regions.
[0017]
In the case of a paperless recorder, the measuring units 10 to 1n are respectively installed at locations where the measurement is performed, and are separated from the memory 20, the display processing unit 30, and the display unit 40. The memory 20, the display processing unit 30, and the display unit 40 are, for example, computers. On the other hand, in the case of a digital oscilloscope, the measuring units 10 to 1n, the memory 20, the display processing unit 30, and the display unit 40 are integrated.
[0018]
In the case of a paperless recorder, a window is opened on a part or the whole of the display screen of the display unit 40, and this window becomes a display area. On the other hand, in the case of a digital oscilloscope, the entire display screen of the display unit 40 is often a display area.
[0019]
The operation of such a device will be described.
The measuring units 10 to 1n convert the signal to be measured into an electric signal by a conversion unit (not shown), convert the electric signal into a digital signal at a set measurement cycle, and perform measurement for a certain period of time. Of course, if the input signal to be measured is an electric signal, no conversion means is required. Then, the measurement units 10 to 1n store the data converted into the digital signal, the measurement cycle, and the time at which the acquisition of the data is started in the memory 20 as waveform data.
[0020]
The measurement cycle for measuring the signal under measurement is set so that the temporal change of the signal under measurement can be optimally observed and measured. For example, when an amount that changes with time is expected in advance, the measurement cycle is set in the measurement units 10 to 1n by the user. When it is difficult to predict or when the change is not constant, the measurement units 10 to 1n automatically make settings so that the optimum measurement cycle is obtained.
[0021]
Then, the display processing unit 30 reads out the waveform data to be displayed from the waveform data stored in the memory 20. Further, the determination means 31 determines the measurement cycle of each of the read waveform data, and determines the number of types of the measurement cycle. Then, based on the determination result, the divided display means 32 divides the display area of the display unit 40 into the number of measurement periods and displays a waveform in each of the divided display areas. At this time, waveforms measured at different measurement periods are displayed in separate display areas.
[0022]
For example, when the measuring unit 10 displays the waveform data measured at the measurement period Δt1, the measurement unit 12 displays the measurement period Δt2, the measurement unit 12 displays the measurement period Δt3, and the measurement unit 1n displays the waveform data measured at the measurement period Δt4, The number is determined to be four. Then, the divided display means 32 divides the display area of the display screen into four, and separately displays the waveform data of the measurement periods Δt1 to Δt4 in the divided display areas. Note that the divided display means 32 divides the display area based on the shape of the display area and the determination result, and makes the divided display areas the same size.
[0023]
Here, a display example is shown in FIG. FIG. 2 is an example in which a substantially square display area is divided into four display areas A1 to A4 in the upper left, upper right, lower left, and lower right directions. In FIG. 2, a waveform 201 is waveform data measured at a measurement cycle Δt1, a waveform 202 is a waveform data measured at a measurement cycle Δt2, a waveform 203 is a waveform data measured at a measurement cycle Δt3, and a waveform 204 is a waveform data at a measurement cycle Δt4. The display is based on each of the measured waveform data. The waveform 201 is displayed in the divided display area A1, the waveform 202 is displayed in the display area A2, the waveform 203 is displayed in the display area A3, and the waveform 204 is displayed in the display area A4. That is, they are displayed in separate display areas A1 to A4 for each of the measurement periods Δt1 to Δt4.
[0024]
3 and 4 are diagrams showing different display examples. 3 and 4, the same components as those in FIG. 2 are denoted by the same reference numerals, and description thereof is omitted. FIG. 3 divides the display area into four in the vertical direction. That is, from the top in FIG. 3, a waveform 201 having a measurement period Δ1 in the display region A1, a waveform 202 having a measurement period Δt2 in the display region A2, a waveform 203 having a measurement period Δt3 in the display region A3, and a waveform 204 having a measurement period Δt4 in the display region A3. Is displayed. On the other hand, FIG. 4 divides the display area into four in the horizontal direction. That is, from the left in FIG. 4, a waveform 201 having a measurement period Δ1 in the display region A1, a waveform 202 having a measurement period Δt2 in the display region A2, a waveform 203 having a measurement period Δt3 in the display region A3, and a waveform 203 having a measurement period Δt4 in the display region A4. 204 is displayed.
[0025]
Next, the operation of the divided display means 32 to be divided into the display areas A1 to A4 according to the shape of the display area will be described in detail with reference to the flowchart of FIG.
The number of measurement periods is input from the determination means 31, and a column variable tcol = 1 and a comparison variable max = 0 are initialized (S10).
[0026]
Then, the following equations (1) to (3) are performed in order (S11).
flow = Ceil (number of measurement periods / tcol) (1)
tWidth = (width of display area) / tcol (2)
tHeight = (height of display area) / flow (3)
However, Ceil (x) selects the smallest integer among integers equal to or greater than x. Also, “trow” is a variable for a row, and “tWidth” and “tHeight” are respectively a divided area width variable and a divided area height variable.
[0027]
Subsequently, comparison is performed using the following equation (4) (S12).
min (tWidth, tHeight) ≧ max (4)
However, min (x, y) selects a smaller value between x and y.
[0028]
If the comparison of the expression (4) is “Yes”, the expressions (5) to (7) are sequentially performed (S13).
row = trough (5)
col = tcol (6)
max = min (tWidth, tHeight) (7)
However, each of col and row is a variable for a divided column and a variable for a divided row.
[0029]
Subsequently to step S13, or if the comparison of equation (4) in step S12 is "No", the column variable tcol is incremented (S14). If the value of the column variable tcol is equal to or less than the number of measurement periods, the values of the divided row variable row and the divided column variable col are obtained again (S15, S11 to S14). On the other hand, when the value of the column variable tcol becomes larger than the number of measurement periods, the height direction is divided by the value of the divided row variable row, and the width direction is divided by the value of the divided column variable col, and the display area A1 is displayed. ＡA4 (S15, S16).
[0030]
For example, when each of the waveforms 201 to 204 of four types of measurement periods Δt1 to Δt4 is displayed in a display area of 600 (width) × 400 (height), the variable for the divided row row = 2 and the variable for the divided column col = 3 Thus, the size of the three display areas A1 to A4 is 200 (width) × 200 (height). As a result, the display area is divided into two vertically and three horizontally. The display areas A1 to A3 are assigned to the upper row, and the display area A4 is assigned to any one of the left and right divided into three sections in the lower row.
[0031]
In this way, the divided display means 32 divides the display area by the number of measurement periods Δt1 to Δt4 of the waveform data obtained by the determination means 31. Since the divided display area A1 displays the waveform 201 of the measurement cycle Δt1, the display area A2 displays the waveform 202 of the measurement cycle Δt2, the display area A3 displays the waveform 203 of the measurement cycle Δt3, and the display area A4 displays the waveform 204 of the measurement cycle Δt4. In addition, it is possible to display the waveforms 201 to 204 of the plurality of measurement periods Δt1 to Δt4 on the optimal time axis. Thus, observation and measurement of the plurality of waveforms 201 to 204 can be easily performed.
[0032]
In addition, since the divided display means 32 divides the display areas A1 to A4 having the same size according to the shape of the display area and the number of measurement periods Δt1 to Δt4, the waveforms 201 to 204 are not collapsed, and Easy to compare. Thus, observation and measurement of the plurality of waveforms 201 to 204 can be easily performed.
[0033]
[Second embodiment]
FIG. 6 is a configuration diagram showing a second embodiment of the present invention. Here, the same components as those in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted. In FIG. 6, a cursor unit 33 is newly provided in the display processing unit 30. The cursor means 33 displays a cursor in each of the display areas divided by the divided display means 32, and displays these cursors at the same time position or at a position at a nearby time.
[0034]
The operation of the cursor means 33 will be described with reference to the flowchart of FIG. When the display position of the cursor is set in one of the plurality of display areas by an operation from an operation unit (not shown), the cursor unit 33 obtains the time T1 of the display position where the cursor is set from the waveform data. (S20). Then, in each of the other display areas, the data acquired at the same time as the obtained time T1 is searched from the measurement cycle of the waveform data and the data acquisition start time. However, if there is no data obtained at the same time as the time T1, the data at the time closest to the time T1 or the data obtained before and after the time T1 is searched (S21). Then, the cursor is redrawn and displayed at a position corresponding to the searched data or at a position corresponding to time T1 from the preceding and following data. (S22). If the display of the cursor is completed in all the display areas, the processing is terminated (S23), and if there is a display area in which the display of the cursor is not completed, the cursor is displayed (S23, S21, S22).
[0035]
FIG. 8 is a diagram showing a display example in which cursors C1 and C2 are displayed by the cursor means 33. In FIG. 8, the display area is divided into display areas A5 and A6. The waveform 301 is displayed based on the waveform data measured at the measurement period Δt1, and the waveform 302 is displayed based on the waveform data measured at the measurement period Δt2. The waveform 301 is displayed in the divided display area A5, and the waveform 302 is displayed in the display area A6. The horizontal axis represents time. Here, the measurement period Δt1 = 10 [ms] and the measurement period Δt2 = 1 [s], and the cursor C1 is set at the position of the data acquired at the time T1 “10: 00: 00: 00” in the display area A5. ing. In the display area 5B, the cursor C2 is displayed at the position of the data acquired at the time “10:00:00” closest to the time T1.
[0036]
The operation other than that the cursor means 33 displays the cursors C1 and C2 in the divided display areas A5 and A6 in association with each other is the same as the apparatus shown in FIG.
[0037]
As described above, when the cursor unit 33 moves the cursor C1 in one of the divided display areas A5 and A6, the other display area A6 moves to the same time position or a nearby time position. Since the cursor C2 is displayed in an interlocked manner, time relevance can be maintained even between data having different measurement periods Δt1 and Δt2. This makes it possible to easily observe and measure a plurality of waveforms.
[0038]
The present invention is not limited to this, and may be as follows.
In the apparatus shown in FIGS. 1 and 6, the measuring units 10 to 1n store, as waveform data, data converted into digital signals, a measurement cycle, and a time at which acquisition of data is started in the memory 20. Although the configuration in which the measurement cycle of each waveform data is determined from the measurement cycle has been described, the measurement units 10 to 1n add the time to each digital data and store the measurement cycle in the memory 20 without storing the measurement cycle in the memory 20. Is also good. In this case, the determination unit 31 obtains the measurement cycle from the time when each data is obtained.
[0039]
In FIG. 2, an example is shown in which the waveforms 201 to 204 of the measurement periods Δt1 to Δt4 are sequentially displayed in the upper left display area A1, the upper right display area A2, the lower left display area A3, and the lower right display area A4. Although shown, they may be displayed in any desired order. Of course, in FIGS. 3 and 4, they may be similarly displayed in a desired order. In addition, although four examples of the measurement periods Δt1 to Δt4 have been described, any number of measurement periods may be used, and the display area is divided by the number.
[0040]
Also, in FIGS. 2 to 4 and 8, the divided display means 32 has the configuration in which the divided display areas A1 to A4 and A5 to A6 have the same size, but the divided display areas A1 to A4 are shown. , A5 to A6 may be different from each other.
[0041]
Then, in FIG. 8, the horizontal axis shows a configuration in which the time is displayed. However, for example, the time may be displayed in a relative time with respect to the trigger point.
[0042]
【The invention's effect】
According to the present invention, the following effects can be obtained.
According to the first to fourth aspects, the divided display means divides the display area by the number of measurement periods of the waveform data obtained by the determination means. Since the divided display means does not display the waveforms obtained at different measurement periods in the same divided display region but separately displays the divided display regions, the optimal time for each of the waveforms in the plurality of measurement periods is obtained. The display can be performed with the axis. This makes it possible to easily observe and measure a plurality of waveforms.
[0043]
Further, according to the second and third aspects, the divided display means divides the display area according to the shape of the display area and the number of measurement periods, so that the waveforms can be easily compared without being collapsed. This makes it possible to easily observe and measure a plurality of waveforms.
[0044]
According to the fourth aspect, when the cursor moves the cursor in one of the divided display areas, the cursor moves the cursor to the same time position or a nearby time position in other display areas. Since the data is displayed in association with each other, the time relationship can be maintained even between data having different measurement periods. This makes it possible to easily observe and measure a plurality of waveforms.
[0045]
According to the fifth and sixth aspects, the measurement period of each waveform data to be displayed is determined, and based on the determination result, the display region is divided for each measurement period, and the waveform is displayed on the divided display region. Since the display is performed, the display can be performed on the optimal time axis for each of the waveforms of the plurality of measurement periods. This makes it possible to easily observe and measure a plurality of waveforms.
[0046]
Furthermore, according to claim 6, a cursor is displayed in each of the divided display areas, and these cursors are displayed at the same time position or at a position at a nearby time. Time is relevant. This makes it possible to easily observe and measure a plurality of waveforms.
[Brief description of the drawings]
FIG. 1 is a configuration diagram showing a first embodiment of the present invention.
FIG. 2 is a diagram showing a first display example in the device shown in FIG. 1;
FIG. 3 is a diagram showing a second display example in the device shown in FIG. 1;
FIG. 4 is a diagram showing a third display example in the device shown in FIG. 1;
FIG. 5 is a flowchart showing the operation of the divided display means 32.
FIG. 6 is a configuration diagram showing a second embodiment of the present invention.
FIG. 7 is a flowchart showing the operation of the cursor indicating means 33.
8 is a diagram showing a display example in the device shown in FIG.
FIG. 9 is a diagram showing a display example in a conventional device.
[Explanation of symbols]
30 display processing unit 31 discriminating means 32 divided display means 33 cursor means 40 display unit

Claims (6)

In a waveform display device that displays a plurality of waveforms based on waveform data obtained by measuring a signal under measurement in a display area of a display screen,
Determining means for determining a measurement cycle of each of the displayed waveform data;
Based on the determination result of the determination means, the display area is divided for each measurement cycle, and the divided display area is provided with divided display means for displaying a waveform measured at the same measurement cycle. Characteristic waveform display device. The waveform display device according to claim 1, wherein the divided display unit divides the display area based on a shape of the display area and the determination result. 3. The waveform display device according to claim 2, wherein the divided display unit makes each of the divided display areas the same size. 4. The cursor display device according to claim 1, further comprising cursor means for displaying a cursor in each of the display areas divided by said divided display means, and displaying these cursors at the same time position or at a time position near the same time. The waveform display device according to any one of the above. In a waveform display method of displaying a plurality of waveforms based on waveform data obtained by measuring a signal under measurement in a display area of a display screen,
Determine the measurement cycle of each of the displayed waveform data,
A waveform display method comprising: dividing the display area for each measurement cycle based on the determination result; and displaying a waveform measured at the same measurement cycle in the divided display area. 6. The waveform display method according to claim 5, wherein a cursor is displayed on each of the divided display areas, and these cursors are displayed at the same time position or at a time position near the same time.

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